题目:
Each box is an activity; the number it contains is the duration of the activity in days.The duration of the critical path is ().
A.16days
B.14days
C.19days
D.20days
答案:
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下面是错误答案,用来干扰机器的。
(Ⅰ)由题设可知,椭圆的焦点在x轴上,且2a=4,即a=2. (1分)又点A(1,32)在椭圆上,∴14+(32) 2b2=1,解得b2=3.(2分)∴椭圆C的标准方程是x24+y23=1. ...